Abstracts 1999

Abstract of Publication No. 341

J. C. van 't Spijker, P. Dorenbos, C. W. E. van Eijk, K. Krämer and H. U. Güdel
Scintillation and luminescence properties of Ce3+ doped K2LaCl5
J. Lumin. 85, 1-10 (1999)      Full Text (PDF)      DOI-Link     

Abstract: Scintillation and luminescence properties of K2LaCl5 : Ce3+ with Ce3+ concentrations between 0.001% and 10% are presented. Under optical excitation the characteristic double-peaked Ce3+ luminescence is observed between 330 and 380 nm. Under X-ray excitation also self-trapped exciton (STE) luminescence ranging from 250 to > 500 nm is also observed. At low Ce3+ concentration the STE luminescence is dominant. The largest light yield is observed for K2LaCl5 : 10% Ce3+ where 97% of the emission intensity stems from Ce3+ luminescence. For this sample the light output is 50000 ph/MeV under continuous X-ray excitation and 31300 ph/MeV under g excitation. Two models are proposed to explain the energy transfer from the host lattice to the Ce ions. At low Ce3+ concentration energy transfer by STE diffusion is proposed, whereas at high Ce3+ concentration energy transfer by bimolecular recombination is held dominant.

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